论文标题
4U 1543-47中黑洞的自旋测量用X射线反射发射约束
The spin measurement of the black hole in 4U 1543-47 constrained with the X-ray reflected emission
论文作者
论文摘要
4U 1543-47是一种低质量X射线二进制，它在我们的银河系中设有一个恒星的黑洞。在本文中，我们重新访问了在2002年爆发的陡峭力量法状态下的7个数据集。 Rossi X射线计时探索器观察到了光谱。我们已经仔细地对X射线反射光谱进行了建模，并与Relxill对这些光谱进行了拟合，以进行反射发射。我们在90％的统计信心下找到了一个中等黑洞的旋转，即$ 0.67 _ { - 0.08}^{+0.15} $。排除了99％以上统计置信度的负和低自旋（<0.5）。此外，我们的结果表明，该模型需要超极性的铁丰度：$ 5.05 _ { - 0.26}^{+1.21} $，内盘的倾斜角度为$ 36.3 _ { - 3.4}^{+5.3} $度。该倾斜角明显大于二元轨道倾斜角（〜21度）。这种差异可能是该X射线二进制系统反射模型中使用的人工低密度密度的系统伪像。
4U 1543-47 is a low mass X-ray binary which harbours a stellar-mass black hole located in our Milky Way galaxy. In this paper, we revisit 7 data sets which were in the Steep Power Law state of the 2002 outburst. The spectra were observed by the Rossi X-ray Timing Explorer. We have carefully modelled the X-ray reflection spectra, and made a joint-fit to these spectra with relxill, for the reflected emission. We found a moderate black hole spin, which is $0.67_{-0.08}^{+0.15}$ at 90% statistical confidence. Negative and low spins (< 0.5) at more than 99% statistical confidence are ruled out. In addition, our results indicate that the model requires a super-solar iron abundance: $5.05_{-0.26}^{+1.21}$, and the inclination angle of the inner disc is $36.3_{-3.4}^{+5.3}$ degrees. This inclination angle is appreciably larger than the binary orbital inclination angle (~21 degrees); this difference is possibly a systematic artefact of the artificially low-density employed in the reflection model for this X-ray binary system.
